[ClusterLabs] Antw: [EXT] Re: Sub‑clusters / super‑clusters?

[Strahil Nikolov]

That's why you need a qdisk at a 3-rd location, so you will have 7 votes in total.When 3 nodes in cityA die, all resources will be started on the remaining 3 nodes.
Best Regards,Strahil Nikolov
 
 
  On Wed, Aug 4, 2021 at 17:23, Antony Stone<Antony.Stone at ha.open.source.it> wrote:   On Wednesday 04 August 2021 at 16:07:39, Andrei Borzenkov wrote:

> On Wed, Aug 4, 2021 at 5:03 PM Antony Stone wrote:
> > On Wednesday 04 August 2021 at 13:31:12, Andrei Borzenkov wrote:
> > > On Wed, Aug 4, 2021 at 1:48 PM Antony Stone wrote:
> > > > On Tuesday 03 August 2021 at 12:12:03, Strahil Nikolov via Users
> > > > wrote:
> > > > > Won't something like this work ? Each node in LA will have same
> > > > > score of 5000, while other cities will be -5000.
> > > > > 
> > > > > pcs constraint location DummyRes1 rule score=5000 city eq LA
> > > > > pcs constraint location DummyRes1 rule score=-5000 city ne LA
> > > > > stickiness -> 10000
> > > > 
> > > > Thanks for the idea, but no difference.
> > > > 
> > > > Basically, as soon as zero nodes in one city are available, all
> > > > resources, including those running perfectly at the other city, stop.
> > > 
> > > That is not what you originally said.
> > > 
> > > You said you have 6 node cluster (3 + 3) and 2 nodes are not available.
> > 
> > No, I don't think I said that?
> 
> "With the new setup, if two machines in city A fail, then _both_
> clusters stop working"

Ah, apologies - that was a typo.  "With the new setup, if the machines in city 
A fail, then _both_ clusters stop working".

So, basically what I'm saying is that with two separate clusters, if one 
fails, the other keeps going (as one would expect).

Joining the two clusters together so that I can have a single floating resource 
which can run anywhere (as well as the exact same location-specific resources 
as before) results in one cluster failure taking the other cluster down too.

I need one fully-working 3-node cluster to keep going, no matter what the 
other cluster does.


Antony.

-- 
It is also possible that putting the birds in a laboratory setting 
inadvertently renders them relatively incompetent.

 - Daniel C Dennett

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